How to Initialize String Pointers in Structs in Go?

Initializing String Pointers in Structs

In Go, initializing a struct with a pointer to a string where the pointer can be nil requires careful handling. The following code snippet exemplifies the challenge:

type Config struct {
  Uri       *string
}

func init() {
  var config = Config{ Uri: "my:default" }
}

This fails with the error:

cannot use "string" (type string) as type *string in field value

To resolve this, one cannot simply point to a constant string value as in the above code. Instead, a variable is needed:

type Config struct {
  Uri       *string
}

func init() {
  v := "my:default"
  var config = Config{ Uri: &v }
}

In this code, the variable v is created and initialized with the desired value. Then, the address of v (i.e., &v) is assigned to the Uri field of the struct. This works because the Uri field is a pointer to a string, and the address of v is of type *string.

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